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发明名称
Transparency projection slide
摘要
申请公布号
US2587434(A)
申请公布日期
1952.02.26
申请号
US19460677070
申请日期
1946.06.15
申请人
EMDE PRODUCTS, INC.
发明人
BOADEN EARL T.;SIMPSON JOSEPH L.
分类号
G03B21/64;G03C11/14
主分类号
G03B21/64
代理机构
代理人
主权项
地址
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